How far is Castle Rock, CO from Aspen, CO?
The driving distance from Castle Rock, CO to Aspen, CO is about 185 miles (297.7 km), with a travel time of about 04h 36m by car.
- The straight-line flight distance is about 105.6 miles (170 km).
- For a round trip, plan for roughly 09h 13m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 36m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Town in Colorado, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Castle Rock and Aspen.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Rock and Aspen.
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1
Start on North Cantril Street
27 m · 8 sec · North Cantril Street
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2
Turn left onto 3rd Street
641 ft · 23 sec · 3rd Street
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3
Exit the roundabout onto 3rd Street
135 m · 18 sec · 3rd Street
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4
Turn right onto North Wilcox Street
2807 ft · 2 min · North Wilcox Street
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5
Take the ramp straight toward I 25 North
1715 ft · 42 sec
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6
Merge slight left
26.6 mi · 30 min
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7
Take the exit slight right toward US 6 West: 6th Avenue
945 ft · 23 sec
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8
Keep slight right to continue on US 6 West: 6th Avenue, Lakewood
2200 ft · 54 sec
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9
Continue on Dinosaur Diamond Prehistoric Highway
1.5 km · 2 min · Dinosaur Diamond Prehistoric Highway
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10
Keep slight left to continue on US 6
609 ft · 11 sec
-
11
Merge slight left onto West 6th Avenue Freeway
7.6 mi · 9 min · West 6th Avenue Freeway
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12
Take the exit slight right toward I 70 West: Grand Junction
1.1 km · 56 sec
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13
Merge slight left
65 mi · 1 hr 19 min
-
14
Take the exit slight right toward CO 91 South: Copper Mountain, Leadville
2195 ft · 42 sec
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15
Continue straight
22.1 mi · 28 min
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16
Continue straight
1.6 km · 2 min
-
17
At the end of the road, turn right onto East 9th Street
599 ft · 21 sec · East 9th Street
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18
Turn slight left onto Harrison Avenue
916 ft · 37 sec · Harrison Avenue
-
19
Turn right onto West 6th Street
1.3 km · 2 min · West 6th Street
-
20
Turn left onto McWethy Drive
2541 ft · 52 sec · McWethy Drive
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21
Turn right
13.9 mi · 18 min
-
22
Turn right
42.9 mi · 1 hr 37 min
-
23
Turn right onto South Original Street
753 ft · 26 sec · South Original Street
-
24
Continue on East Main Street
1095 ft · 41 sec · East Main Street
-
25
Turn right onto North Galena Street
45 m · 7 sec · North Galena Street
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26
Turn left
17 m · 2 sec
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27
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Castle Rock and Aspen.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 70 West
Merge slight left
65 mi · 01h 19m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Castle Rock and Slight Chance Snow Showers near Aspen.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Rock to Aspen?
The road trip is about 185 miles (297.7 km) and usually takes 04h 36m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Silverthorne is a useful midpoint, sitting about 92.4 miles from Castle Rock and 92.5 miles from Aspen.
How much longer is the road route than the straight-line distance?
The direct path is about 105.6 miles (170 km), while the road route adds roughly 79.4 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 7:46 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.15 one way or $48.30 round trip. Estimated CO2 is about 58 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Castle Rock and Slight Chance Snow Showers near Aspen.
Stop Ideas Near Silverthorne
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Silverthorne.
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Flight Path Map
This map shows the direct air route between Castle Rock and Aspen. Straight-line distance: 105.64 mi (170.01 km).
#1 Castle Rock
The most populous city in Douglas County, Colorado.
| Population | 70,567 |
| Coordinates | 39.3722100, -104.8560900 |
| Altitude | 1897 |
| Country | United States |
#2 Aspen
Town in Pitkin County, Colorado, USA
| Population | 7,657 |
| Coordinates | 39.1911000, -106.8175400 |
| Altitude | 2405 |
| Country | United States |
End: Aspen (-106.81754, 39.1911)
Estimated Travel Time
Distance: 298 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 09m |
| 40 mph (64.37 km/h) | 04h 37m |
| 50 mph (80.47 km/h) | 03h 41m |
| 60 mph (96.56 km/h) | 03h 04m |
| 70 mph (112.65 km/h) | 02h 38m |
| 80 mph (129 km/h) | 02h 18m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $24.15 | $48.30 |
| Mid-grade | $4.08 | $26.67 | $53.34 |
| Premium | $4.39 | $28.67 | $57.35 |
| Diesel | $4.74 | $30.93 | $61.87 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Colorado · Apr 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.